DocumentCode :
2050622
Title :
Properties of GEMs and the GEM-MGC combination [gas electron multipliers]
Author :
Hollander, R.W. ; van den Berg, F.D. ; van Eijk, C.W.E. ; van Vuure, T.L.
Author_Institution :
Radiat. Technol. Group, Delft Univ. of Technol., Netherlands
Volume :
2
fYear :
1999
fDate :
1999
Firstpage :
597
Abstract :
Gas electron multipliers, can be used as charge (pre) amplifiers as well as light producing imaging devices. We have examined GEMs as charge amplifiers in several gas mixtures, including Ar-DME, Xe-DME, Xe-CO2 as well as in pure argon and xenon. The operation of a single GEM, cascaded GEMs and a combination of a GEM and a micro gap chamber (MGC) have been studied using ~6 keV X-rays. The collected charge cloud in the gas mixtures is limited to ~107 electrons using two GEMs in tandem mode with a pad read out, and 2.7·107 electrons using a MGC as read out. These values correspond with a gain of ~105 for 5.9 keV X-rays from 55Fe. The stability of the gain in gas mixtures is better than 10% except for Ar/DME 60/40, where the stability depends on the gain. In pure argon and xenon the maximal gain is respectively 4000 and 7000, using two GEMs in tandem mode. The field strength distribution for optimal operation of a GEM is studied in detail
Keywords :
X-ray detection; amplification; electron multipliers; position sensitive particle detectors; 5.9 keV; 6 keV; Ar; Ar-DME mixture; X-rays; Xe; Xe-CO2; Xe-DME mixture; charge cloud; field strength distribution; gain; gas electron multipliers; micro gap chamber; Anodes; Argon; Cathodes; Copper; Electron multipliers; Lenses; Preamplifiers; Strips; X-rays; Xenon;
fLanguage :
English
Publisher :
ieee
Conference_Titel :
Nuclear Science Symposium, 1999. Conference Record. 1999 IEEE
Conference_Location :
Seattle, WA
ISSN :
1082-3654
Print_ISBN :
0-7803-5696-9
Type :
conf
DOI :
10.1109/NSSMIC.1999.845742
Filename :
845742
Link To Document :
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